Rigless casing cutting/pulling stand

ABSTRACT

A tool for removing a portion of a casing from a wellbore. The tool includes a base having an opening or bore formed therethrough. A plurality of hydraulic cylinders may each have a first end portion coupled to the base and a second end portion distal the base. A first crane may be coupled to the base. A tong may be coupled to the first crane, and the first crane may be adapted to move the tong into alignment with the opening in the base. A second crane may be coupled to the base. An attachment may be coupled to the second crane, and the second crane may be adapted to move the attachment into alignment with the opening in the base and proximate the second end portions of the cylinders.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application claims the benefit of related U.S. ProvisionalApplication Ser. No. 61/654624 filed Jun. 1, 2012, titled, “RiglessCasing Cutter/Pulling Stand,” to Eric Boudreaux, the disclosure of whichis incorporated by reference herein in its entirety.

BACKGROUND

When a wellbore is no longer producing, the wellbore is plugged, and aportion of the casing above the plug is removed. To remove the casing, adrill pipe is lowered into the wellbore to a point above the plug. Apipe (or casing) cutter coupled to the lower end portion of the drillpipe is then actuated such that one or more knives or blades extendradially-outward to engage an inner surface of the casing. A swivelstand at the surface grips the drill pipe and causes the drill pipe andthe pipe cutter to rotate. The rotating pipe cutter cuts the casing intoupper and lower axial segments.

After the cutting is complete, the swivel stand is moved, and in itsplace is positioned a casing jack stand. The casing jack stand is usedto pull the upper axial segment of the casing up and out of thewellbore. When the upper segment of the casing is no longer disposed inthe wellbore, the wellbore will eventually fill in over time, returningthe formation to its original state.

Replacing the swivel stand with the casing jack stand is a timeconsuming process, which results in lost profits in the field. Further,oftentimes the casing is not fully cut into the two axial segments(i.e., the two casing segments are still partially coupled together),and the casing jack is unable to pull the upper axial segment to thesurface. When this occurs, the casing jack stand is moved, and in itsplace is repositioned the swivel stand to finish the cutting of thecasing. This further increases the time to remove the upper segment ofthe casing.

What is needed, therefore, is an improved apparatus and method forcutting the casing in a wellbore into two segments and removing theupper segment from the wellbore.

SUMMARY

This summary is provided to introduce a selection of concepts that arefurther described below in the detailed description. This summary is notintended to identify key or essential features of the claimed subjectmatter, nor is it intended to be used as an aid in limiting the scope ofthe claimed subject matter.

A tool for removing a portion of a casing from a wellbore is provided.The tool may include a base having an opening or bore formedtherethrough. A plurality of hydraulic cylinders may have first endportions coupled to the base and second end portions distal the base. Afirst crane may be coupled to the base. A tong may be coupled to thefirst crane, and the first crane may move the tong into alignment withthe opening or bore in the base. A second crane may be coupled to thebase. An attachment may be coupled to the second crane, and the secondcrane may move the attachment into alignment with the opening or bore inthe base and proximate the second end portions of the plurality ofhydraulic cylinders.

A method for removing a portion of a casing from a wellbore is alsoprovided. The method may include moving a tong into alignment with anopening or bore formed through a base of a tool using a first cranecoupled to the base. The tool may include a plurality of hydrauliccylinders. The hydraulic cylinders may have first end portions coupledto the base and second end portions distal the base. Two or moresegments of a drill pipe may be screwed together using the tong. Thedrill pipe may be introduced into a wellbore disposed below the base andaligned with the opening or bore. A casing may be disposed in thewellbore and disposed radially outward from the drill pipe. A firstattachment may be moved into a first position aligned with the openingor bore in the base and proximate the second end portions of thecylinders using a second crane coupled to the base. The first attachmentmay couple to the drill pipe.

In another embodiment, the method may include moving a tong intoalignment with an opening or bore formed through a base of a tool usinga first crane coupled to the base. The tool may include a plurality ofhydraulic cylinders having first end portions coupled to the base andsecond end portions distal the base. Two or more segments of a drillpipe may be screwed together using the tong. The drill pipe may beintroduced into a wellbore disposed below the base and aligned with theopening or bore. A casing is disposed in the wellbore and disposedradially outward from the drill pipe. A first attachment may be movedinto a first position aligned with the opening or bore in the base andproximate the second end portions of the cylinders using a second cranecoupled to the base. The first attachment may couple to the drill pipe.The drill pipe may be rotated via the first attachment to cut the casinginto first and second segments with one or more knives coupled to thedrill pipe. The first attachment may be moved into a second positionusing the second crane such that the first attachment is not alignedwith the opening or bore in the base and is not coupled to the drillpipe. A second attachment may be moved into the first position with thesecond crane. The second attachment may couple to the drill pipe when inthe first position. The drill pipe may couple to the first segment ofthe casing. The drill pipe and the first segment of the casing may belifted, e.g., out of the wellbore, using the second attachment.

BRIEF DESCRIPTION OF THE DRAWINGS

So that the recited features can be understood in detail, a moreparticular description, briefly summarized above, can be had byreference to one or more embodiments, some of which are illustrated inthe appended drawings. It is to be noted, however, that the appendeddrawings illustrate only typical embodiments, and are, therefore, not tobe considered limiting of its scope, for the invention can admit toother equally effective embodiments.

FIG. 1 depicts a perspective view of an illustrative tool for removing acasing from a wellbore, according to one or more embodiments disclosed.

FIG. 2 depicts a front view of the tool having a plurality of cylindersin an extended position, according to one or more embodiments disclosed.

FIG. 3 depicts a side view of the tool having the plurality of cylindersin the extended position, according to one or more embodimentsdisclosed.

FIG. 4 depicts a perspective view of the tool having a swivel headattachment coupled to a second crane, according to one or moreembodiments disclosed.

FIG. 5 depicts a perspective view of the tool having the swivel headattachment coupled to connectors disposed above a plurality ofcylinders, according to one or more embodiments disclosed.

FIG. 6 depicts a perspective view of the tool having a casing jackattachment coupled to the second crane, according to one or moreembodiments disclosed.

FIG. 7 depicts a perspective view of the casing jack attachment coupledto the connectors disposed above the cylinders, according to one or moreembodiments disclosed.

FIG. 8 depicts a cross-sectional view of the tool introducing a drillpipe into a wellbore, according to one or more embodiments disclosed.

FIG. 9 depicts a cross-sectional view of the swivel head attachmentcoupled to the drill pipe, according to one or more embodimentsdisclosed.

FIG. 10 depicts a cross-sectional view of the casing jack attachmentcoupled to the drill pipe, according to one or more embodimentsdisclosed.

FIG. 11 depicts a cross-sectional view of the cylinders lifting thedrill pipe and the upper segment of the casing, according to one or moreembodiments disclosed.

FIG. 12 depicts a cross-sectional view of the wellbore after the uppersection of the casing has been removed, according to one or moreembodiments disclosed.

DETAILED DESCRIPTION

As generally shown in FIG. 1, a tool 100 for removing a portion of acasing 404 (FIG. 8) from a wellbore 400 (FIG. 8) is provided. The tool100 may include a base 102 having an opening or bore 104 formedtherethrough. A plurality of hydraulic cylinders 106-1, 106-2, 106-3,106-4 may each have a first end portion 107 coupled to the base 102 anda second end portion 109 distal the base 102. A first crane 110 may becoupled to the base 102. A tong 120 may be coupled to the first crane110, and the first crane 110 may move the tong 120 into alignment withthe opening 104 in the base 102. As generally shown in FIG. 2, a secondcrane 130 may be coupled to the base 102. An attachment 200 (FIG. 4),300 (Figure 6) may be coupled to the second crane 130, and the secondcrane 130 may move the attachment 200, 300 into alignment with theopening 104 in the base 102 and proximate the second end portions 109 ofthe cylinders 106-1, 106-2, 106-3, 106-4.

FIG. 1 depicts a perspective view of an illustrative tool 100 forremoving a casing from a wellbore, according to one or more embodiments.The tool 100 includes a base 102 that may be positioned on the surfaceabove a wellbore. The base 102 has a length L and a width W, eachranging from a low of about 1.5 m, about 2 m, or about 2.5 m to a highof about 3.5 m, about 4 m, about 4.5 m, or more. For example, the lengthL may be between about 2.75 m and about 3.25 m, and the width W may bebetween about 2.25 m and about 2.75 m. The base 102 has a height Hranging from a low of about 10 cm, about 15 cm, or about 20 cm to a highof about 30 cm, about 40 cm, about 50 cm, or more. For example, the base102 may have a height H between about 20 cm and about 35 cm.

An opening or bore 104 is formed in the base 102 through which a drillstring or drill pipe may be introduced to the wellbore. The opening 104may have a cross-sectional length (e.g., diameter) ranging from a low ofabout 20 cm, about 30 cm, about 40 cm, or about 50 cm to a high of about70 cm, about 80 cm, about 90 cm, about 100 cm, or more. For example, thecross-sectional length of the opening 104 may be between about 20 cm andabout 50 cm or between about 50 cm and about 80 cm.

A plurality of hydraulic cylinders (four are shown 106-1, 106-2, 106-3,106-4) may be coupled to the base 102 and extend generally upwardtherefrom. More particularly, the cylinders 106-1, 106-2, 106-3, 106-4may each have a first end portion 107 coupled to the base 102 and asecond end portion 109 distal the base 102. The terms “couple,”“coupled,” “connect,” “connection,” “connected,” “in connection with,”and “connecting” refer to “in direct connection with” or “in connectionwith via one or more elements or members.” The terms “inner” and“outer;” “up” and “down;” “upper” and “lower;” “upward” and “downward;”“above” and “below;” and other like terms as used herein refer torelative positions to one another and are not intended to denote aparticular direction or spatial orientation.

A connector 108 may be coupled to the second end portion 109 of eachcylinder 106-1, 106-2, 106-3, 106-4. In at least one embodiment, supportbeams (two are shown 111, 113) may be coupled to the second end portions109 of the cylinders 106-1, 106-2, 106-3, 106-4, and the connectors 108may be coupled to the support beams 111. As shown, a first support beam111 may be coupled to the second end portions 109 of the first andsecond cylinders 106-1, 106-2, and a second support beam 113 may becoupled to the second end portions 109 of the third and fourth cylinders106-3, 106-4. As such, the connectors 108 may be coupled to the secondend portions 109 of the cylinders 106-1, 106-2, 106-3, 106-4 via thesupport beams 111, 113. A swivel head attachment 200 may be coupled tothe connectors 108, as discussed in greater detail with respect to FIG.4.

The cylinders 106-1, 106-2, 106-3, 106-4 may be positioned in two rowsof two such that they form a rectangle on the base 102. For example, thefirst row may include the first and second cylinders 106-1, 106-2, andthe second row may include the third and fourth cylinders 106-3, 106-4.The distance between the first and second cylinders 106-1, 106-2, andthe distance between the third and fourth cylinders 106-3, 106-4, mayrange from a low of about 1 m, about 1.25 m, or about 1.5 m to a high ofabout 2 m, about 2.5 m, about 3 m, or more. For example, the distancebetween the first and second cylinders 106-1, 106-2, and the distancebetween the third and fourth cylinders 106-3, 106-4, may be betweenabout 1.4 m and about 1.6 m. The distance between the first and secondrows may range from a low of about 1 m, about 1.25 m, or about 1.5 m toa high of about 2 m, about 2.5 m, about 3 m, or more. For example, thedistance between the first and second rows may be between about 1.4 mand about 1.6 m. The opening 104 may be positioned between the first andsecond rows.

The cylinders 106-1, 106-2, 106-3, 106-4 may each have a diameterranging from a low of about 10 cm, about 14 cm, or about 18 cm to a highof about 22 cm, about 26 cm, about 30 cm, or more. For example thecylinders 106-1, 106-2, 106-3, 106-4 may have a diameter between about18 cm and about 22 cm.

A first or “jib” crane 110 may be coupled to the base 102. The firstcrane 110 may include a mast 112 coupled to the base 102 and extendingupward therefrom. A jib 114 may be coupled to the upper end portion ofthe mast 112 and extend laterally outward therefrom. The jib 114 may beadapted to rotate around the mast 112 up to about 270°, about 290°,about 310°, about 330°, about 350°, or about 360°.

A trolley 116 may be coupled to the jib 114 and adapted to move or slideaxially along the jib 114 (i.e., toward and away from the mast 112). Afirst end portion of a cable 118 may be coupled to the trolley 116, anda second end portion of the cable 118 may be coupled to a drill pipetong 120. The trolley 116 may be arranged and designed to lift the tong120 upward toward the jib 114 and/or lower the tong 120 downward awayfrom the jib 114 via the cable 118.

The first crane 110 may be adapted to move the tong 120 from a first or“inactive” position, where the tong 120 is not positioned over the base102 (or the opening 104 in the base 102), to a second or “active”position, where the tong 120 is disposed above and aligned with theopening 104 in the base 102 (see FIG. 8). When the tong 120 is in thesecond position, the tong 120 may screw two sections of drill pipetogether before they are introduced into the wellbore via the opening104, or unscrew two sections of drill pipe from one another as they arebeing pulled out of the wellbore via the opening 104, as described inmore detail below.

FIG. 2 depicts a front view of the tool 100 having the cylinders 106-1,106-2, 106-3, 106-4 in an extended position, and FIG. 3 depicts a sideview of the tool 100 having the cylinders 106-1, 106-2, 106-3, 106-4 inthe extended position, according to one or more embodiments. Thecylinders 106-1, 106-2, 106-3, 106-4 may each include a piston 117-1,117-2, 117-3, 117-4 that is adapted to move or stroke up and down withrespect to the base 102. The distance of the stroke may range from a lowof about 0.1 m, about 0.2 m, about 0.4 m, about 0.6 m, about 0.8 m, orabout 1 m to a high of about 1.6 m, about 1.8 m, about 2.0 m, about 2.5m, about 3.0 m, or more. For example, the distance of the stroke may bebetween about 1.6 m and about 2 m. The cylinders 106-1, 106-2, 106-3,106-4 may be adapted to lift a load (e.g., the drill pipe and/or acasing) weighing up to about 150,000 kg, about 200,000 kg, about 250,000kg, or more. For example, the cylinders 106-1, 106-2, 106-3, 106-4 maybe adapted to lift between about 220,000 kg and about 240,000 kg.

The tool 100 may further include a second or “knuckleboom” crane 130coupled to the base 102. The first crane 110 may be coupled to a firstside 103 of the base 102, and the second crane 130 may be coupled to asecond side 105 of the base 102 (see FIG. 3). The second crane 130 mayinclude two or more segments (three are shown 132, 134, 136). Eachsegment 132, 134, 136 may range from a low of about 0.5, about 1 m, orabout 1.5 m to a high of about 2 m, about 2.5 m, about 3 m, or more. Forexample, the segments 132, 134, 136 may be between about 1.75 m andabout 2.25 m. The segments 132, 134, 136 may be coupled together withone or more knuckles or joints (two are shown 138, 140). The joints 138,140 may enable the second crane 130 to extend vertically and/orlaterally into multiple positions. FIGS. 2 and 3 each depict threeillustrative positions for the second crane 130. In the first position,the first segment 132 is substantially vertical, and the second andthird segments 134, 136 are substantially lateral. In the secondposition, the first and second segments 132, 134 are substantiallyvertical, and the third segment 136 is substantially lateral. In thethird position, the first, second, and third segments 132 134, 136 areeach substantially vertical. However, as may be appreciated, thesepositions are merely illustrative, and each of the first, second, andthird segments 132, 134, 136 may be adapted to be vertical, lateral, orany angle therebetween.

The second crane 130 may also rotate around a vertical axis 131 up toabout 270°, about 290°, about 310°, about 330°, about 350°, or about360°. Accordingly, this range of motion may enable the second crane 130to pick up an attachment from a position external to the tool 100 (e.g.,the ground or the back of a truck) and place it on top of the cylinders106-1, 106-2, 106-3, 106-4, as described in more detail below.Similarly, the second crane 130 may remove the attachment from the topof the cylinders 106-1, 106-2, 106-3, 106-4 and place it in a positionexternal to the tool 100.

FIG. 4 depicts a perspective view of the tool 100 having a swivel headattachment 200 coupled to the second crane 130, and FIG. 5 depicts aperspective view of the tool 100 having the swivel head attachment 200coupled to the connectors 108 disposed above the cylinders 106-1, 106-2,106-3, 106-4, according to one or more embodiments. The swivel headattachment 200 may include two parallel beams 202, 204 coupled togetherwith one or more cross beams 206, 208. An end portion of each parallelbeam 202, 204 may include a connector 210.

The swivel head attachment 200 may also include an engagement member 212extending downwardly therefrom. The engagement member 212 may be coupledto and adapted to rotate a drill pipe, as described in more detailbelow. The engagement member 212 may also inject a fluid into the drillpipe. When the engagement member 212 is coupled to the drill pipe, theswivel head attachment 200 may be adapted to support a load up to about100,000 kg, about 125,000 kg, about 150,000 kg, or more.

One or more cables 144 may be used to couple a distal end portion 142 ofthe second crane 130 to the swivel head attachment 200. The second crane130 may be adapted to move the swivel head attachment 200 from a firstor “inactive” position, where the swivel head attachment 200 is notpositioned over the base 102 or the opening 104 in the base 102 (asshown in FIG. 4), to a second or “active” position, where the swivelhead attachment 200 is positioned above the cylinders 106-1, 106-2,106-3, 106-4 and aligned with the opening 104 in the base 102 (as shownin FIG. 5). When in the second position, the connectors 210 on theswivel head attachment 200 may be coupled to the correspondingconnectors 108 disposed on the second end portions 109 of the cylinders106-1, 106-2, 106-3, 106-4 with a pin or bolt 115.

FIG. 6 depicts a perspective view of the tool 100 having a casing jackattachment 300 coupled to the second crane 130, and FIG. 7 depicts aperspective view of the tool 100 having the casing jack attachment 300coupled to the connectors 108 disposed above the cylinders 106-1, 106-2,106-3, 106-4, according to one or more embodiments. As explained in moredetail below, after the swivel head attachment 200 has been used, thesecond crane 130 may remove the swivel head attachment 200 from thesecond end portions 109 of the cylinders 106-1, 106-2, 106-3, 106-4. Thecables 144 may then be used to couple the distal end portion 142 of thesecond crane 130 to a casing jack attachment 300.

The casing jack attachment 300 may include two parallel beams 302, 304coupled together with one or more cross beams 306, 308. An end portionof each parallel beam 302, 304 may include a connector 310. The casingjack attachment 300 may include a jack 312 coupled thereto. In at leastone embodiment, the jack 312 may be coupled to an upper surface 314 ofthe casing jack attachment 300, as shown. The jack 312 may be amechanical jack, a hydraulic jack, a pneumatic jack or the like. Thejack 312 may be adapted to support and/or lift a load (e.g., drill pipeand/or casing) up to about 150,000 kg, about 200,000 kg, about 250,000kg, or more. For example, the jack 312 may be adapted to lift betweenabout 220,000 kg and about 240,000 kg.

The second crane 130 may be adapted to move the casing jack attachment300 from a first or “inactive” position, where the where the casing jackattachment 300 is not positioned over the base 102 or the opening 104 inthe base 102 (as shown in FIG. 6), to a second or “active” position,where the casing jack attachment 300 is positioned above the cylinders106-1, 106-2, 106-3, 106-4 and over the opening 104 in the base 102 (asshown in FIG. 7). When in the second position, the connectors 310 on thecasing jack attachment 300 may be coupled to the correspondingconnectors 108 disposed on the second end portions 109 of the cylinders106-1, 106-2, 106-3, 106-4 with the pins 115.

The tool 100 may include one or more power sources (not shown). Thepower source(s) may be adapted to supply hydraulic power to thecylinders 106-1, 106-2, 106-3, 106-4, the first crane 110, the secondcrane 130, the swivel head attachment 200 and/or the casing jackattachment 300. The power source(s) may include one or more engines, oneor more pumps, and one or more diesel and/or hydraulic tanks Forexample, the power source may include two engines, two pump packages,and two diesel and/or hydraulic tanks The tool 100 may be controlledremotely with one or more remote controls or “belly packs” (not shown)360° around the tool 100.

FIGS. 8-12 depict an illustrative method for removing a portion of acasing 404 from a wellbore 400. More particularly, FIG. 8 depicts across-sectional view of the tool 100 introducing a drill pipe 406 intothe wellbore 400, according to one or more embodiments. A plug 408 maybe introduced into a wellbore 400 having a casing 404 disposed therein.The plug 408 may be expanded radially outward and into contact with theinner surface of the casing 404 to prevent fluid from flowingtherethrough in both directions. The tool 100 may then be positionedover the wellbore 400 such that the opening 104 in the base 102 isaligned with the wellbore 400 and the casing 404. The first crane 110may then be rotated into the active position where the tong 120 isvertically aligned with the opening 104 in the base 102. In at least oneembodiment, the first crane 110 may include a hydraulic piston orcylinder or other device adapted to lift the jib 114 up and over one ormore of the cylinders 106-1, 106-2, 106-3, 106-4 while the first crane110 is rotated into the active position.

A drill pipe 406 may be introduced to the wellbore 400 and disposedradially inward from the casing 404. The drill pipe 406 may include oneor more segments (three are shown 406-1, 406-2, 406-3). The tong 120 mayhold one segment stationary (e.g., 406-2) while rotating an axiallyadjacent segment (e.g., 406-1) to screw or couple the segments 406-1,406-2 together as the drill pipe 406 is being introduced to the wellbore404. When the drill pipe 406 reaches the desired depth in the wellbore400, the first crane 110 may rotate the tong 120 to the inactiveposition where it is no longer vertically aligned with the opening 104in the base 102. A gripping device (shown proximate 104), such as arotary table, may be used to grip the drill pipe 406 while the tong 120couples the segments 406-1, 406-2 together and/or after the tong 120releases the drill pipe 406 and moves to the inactive position.

FIG. 9 depicts a cross-sectional view of the swivel head attachment 200coupled to the drill pipe 406, according to one or more embodiments. Theswivel head attachment 200 may be coupled to the distal end portion 142of the second crane 130, and the second crane 130 may move and/or rotateto place the swivel head attachment 200 above the cylinders 106-1,106-2, 106-3, 106-4. The pins 115 may be inserted to secure theconnectors 210 of the swivel head attachment 200 to the connectors 108of the tool 100. The engagement member 212 of the swivel head attachment200 may be coupled to the upper segment 406-1 of the drill pipe 406.

The lower segment 406-3 of the drill pipe 406 may include a pipe cutterhaving one or more blades or knives 410 coupled thereto. The knives 410may be folded against (or inward of) the outer surface of the drill pipe406 as the drill pipe 406 is lowered into the wellbore 400. Theengagement member 212 of the swivel head attachment 200 may thenintroduce a fluid (e.g., a drilling fluid) into the drill pipe 406. Thefluid may cause the knives 410 to expand radially outward and intocontact with the inner surface of the casing 404. The engagement member412 may then rotate the drill pipe 406 and the knives 410, therebycausing the knives 410 to cut the casing 404 into a first or “upper”casing segment 404-1 and a second or “lower” casing segment 404-2.

FIG. 10 depicts a cross-sectional view of the casing jack attachment 300coupled to the drill pipe 406, according to one or more embodiments.Once the knives 410 have cut through the casing 404, the fluid flow intothe drill pipe 406 may be reduced or cut off. When the fluid flow stops,the knives 410 may move or fold radially inward such that they are nolonger in contact with the casing 404. The drill pipe 406 may then bepulled out of the wellbore 400.

Once the drill pipe 406 is out of the wellbore 400, the pipe cutter maybe removed from the drill pipe 406. The pipe cutter may be replaced witha spear (e.g., a casing spear) 420 that is coupled to the lower segment406-3 of the drill pipe 406. The tong 120 may be rotated back intoalignment with the opening 104 in the base 102 to screw the segments206-1, 406-2, 406-3 of the drill pipe 406 together as they are run intothe wellbore 404 in the same manner as shown in FIG. 8. A casing spear420 may then be actuated by, for example, lifting and rotating the drillpipe 406 (e.g., counterclockwise). When the casing spear 420 isactuated, one or more arms of the casing spear 420 expand radiallyoutward and into contact with the inner surface of the first segment404-1 of the casing 404 to couple the first segment 404-1 of the casing404 to the drill pipe 406.

The distal end portion 142 of the second crane 130 may be re-coupled tothe swivel head attachment 200, and the second crane 130 may move theswivel head attachment 200 to the inactive position external to the tool100. The casing jack attachment 300 may then be coupled to the distalend portion 142 of the second crane 130, and the second crane 130 maymove and/or rotate to place the casing jack attachment 300 in the activeposition above the cylinders 106-1, 106-2, 106-3, 106-4 and aligned withthe opening 104. The pins 115 may be inserted to secure the connectors310 of the casing jack attachment 300 to the connectors 108 of the tool100. The jack 312 of the casing jack attachment 300 may be coupled tothe upper segment 406-1 of the drill pipe 406.

FIG. 11 depicts a cross-sectional view of the cylinders 106-1, 106-2,106-3, 106-4 lifting the drill pipe 406 and the first segment 404-1 ofthe casing 404, according to one or more embodiments. While the spear420 is coupled to the first segment 404-1 of the casing 404, thecylinders 106-1, 106-2, 106-3, 106-4 may extend upward to hydraulicallylift the drill pipe 406 and the first segment 404-1 of the casing 404about 0.1 m or more, about 0.25 m or more, about 0.5 m or more, about 1m or more, about 1.5 m or more, or about 2 m or more. Lifting the drillpipe 406 and the first segment 404-1 of the casing 404 may confirm thatthe casing 404 has been successfully cut into first and second segments404-1, 404-2. Once confirmed, the cylinders 106-1, 106-2, 106-3, 106-4may be lowered back into their original position.

FIG. 12 depicts a cross-sectional view of the wellbore 400 after thefirst segment 404-1 of the casing 404 has been removed, according to oneor more embodiments. The jack 312 may lift the drill pipe 406 and thefirst segment 404-1 of the casing 404 up and out of the wellbore 400.After the first segment 404-1 of the casing 404 has been removed fromthe wellbore 400, the wellbore 400 may be filled in with cement and/orfilled in by the formation to abandon the wellbore 400.

Although only a few example embodiments have been described in detailabove, those skilled in the art will readily appreciate that manymodifications are possible in the example embodiments without materiallydeparting from “Rigless Casing Cutting/Pulling Stand.” Accordingly, allsuch modifications are intended to be included within the scope of thisdisclosure as defined in the following claims. In the claims,means-plus-function clauses are intended to cover the structuresdescribed herein as performing the recited function and not onlystructural equivalents, but also equivalent structures. Thus, although anail and a screw may not be structural equivalents in that a nailemploys a cylindrical surface to secure wooden parts together, whereas ascrew employs a helical surface, in the environment of fastening woodenparts, a nail and a screw may be equivalent structures. It is theexpress intention of the applicant not to invoke 35 U.S.C. §112,paragraph 6 for any limitations of any of the claims herein, except forthose in which the claim expressly uses the words ‘means for’ togetherwith an associated function.

Certain embodiments and features have been described using a set ofnumerical upper limits and a set of numerical lower limits. It should beappreciated that ranges including the combination of any two values,e.g., the combination of any lower value with any upper value, thecombination of any two lower values, and/or the combination of any twoupper values are contemplated unless otherwise indicated. Certain lowerlimits, upper limits and ranges appear in one or more claims below. Allnumerical values are “about” or “approximately” the indicated value, andtake into account experimental error and variations that would beexpected by a person having ordinary skill in the art.

Various terms have been defined above. To the extent a term used in aclaim is not defined above, it should be given the broadest definitionpersons in the pertinent art have given that term as reflected in atleast one printed publication or issued patent. Furthermore, allpatents, test procedures, and other documents cited in this applicationare fully incorporated by reference to the extent such disclosure is notinconsistent with this application and for all jurisdictions in whichsuch incorporation is permitted.

What is claimed is:
 1. A tool for removing a portion of a casing from awellbore, comprising: a base having an opening formed therethrough; aplurality of hydraulic cylinders having first end portions coupled tothe base and second end portions distal the base; a first crane coupledto the base; a tong coupled to the first crane, wherein the first craneis adapted to move the tong into alignment with the opening in the base;a second crane coupled to the base; and an attachment coupled to thesecond crane, wherein the second crane is adapted to move the attachmentinto alignment with the opening in the base and proximate the second endportions of the plurality of hydraulic cylinders.
 2. The tool of claim1, wherein the first crane is a jib crane, and wherein the second craneis a knuckleboom crane.
 3. The tool of claim 1, wherein the attachmentis coupled to the second end portions of the plurality of hydrauliccylinders.
 4. The tool of claim 3, wherein the plurality of hydrauliccylinders are adapted to extend upward, thereby lifting the attachment.5. The tool of claim 1, wherein the tong is adapted to screw two or moresections of drill pipe together or to unscrew the two or more sectionsof drill pipe from one another.
 6. The tool of claim 5, wherein theattachment comprises a swivel head attachment for rotating the drillpipe.
 7. The tool of claim 6, wherein the swivel head attachment isadapted to introduce a fluid to the drill pipe.
 8. The tool of claim 5,wherein the attachment comprises a casing jack attachment.
 9. The toolof claim 8, wherein the casing jack attachment is adapted to lift thedrill pipe.
 10. A method for removing a portion of a casing from awellbore, comprising: moving a tong into alignment with an openingformed through a base of a tool using a first crane coupled to the base,wherein the tool comprises a plurality of hydraulic cylinders havingfirst end portions coupled to the base and second end portions distalthe base; screwing two or more segments of a drill pipe together withthe tong; introducing the drill pipe into a wellbore disposed below thebase and aligned with the opening, wherein a casing is disposed in thewellbore and disposed radially outward from the drill pipe; and moving afirst attachment into a first position aligned with the opening in thebase and proximate the second end portions of the cylinders using asecond crane coupled to the base, the first attachment coupling to thedrill pipe.
 11. The method of claim 10, further comprising: introducinga plug into the wellbore; and expanding the plug radially outward andinto contact with an inner surface of the casing.
 12. The method ofclaim 10, wherein the drill pipe comprises one or more knives coupledthereto, and further comprising introducing a fluid into the drill pipewith the first attachment to cause the one or more knives to moveradially outward and into contact with the casing.
 13. The method ofclaim 12, further comprising rotating the drill pipe via the firstattachment to cut the casing into first and second segments with theknives.
 14. The method of claim 13, further comprising: moving the firstattachment into a second position with the second crane, wherein thefirst attachment when in the second position is not aligned with theopening in the base and is not coupled to the drill pipe; and moving asecond attachment into the first position with the second crane, thesecond attachment coupling with the drill pipe when in the firstposition.
 15. The method of claim 14, further comprising: coupling thedrill pipe to the first segment of the casing; and extending thecylinders upward, thereby lifting the second attachment, the drill pipe,and the first segment of the casing.
 16. The method of claim 15, whereina spear couples the drill pipe to the first segment of the casing.
 17. Amethod for removing a portion of a casing from a wellbore, comprising:moving a tong into alignment with an opening formed through a base of atool using a first crane coupled to the base, wherein the tool comprisesa plurality of hydraulic cylinders having first end portions coupled tothe base and second end portions distal the base; screwing two or moresegments of a drill pipe together with the tong; introducing the drillpipe into a wellbore disposed below the base and aligned with theopening, wherein a casing is disposed in the wellbore and disposedradially outward from the drill pipe; moving a first attachment into afirst position aligned with the opening in the base and proximate thesecond end portions of the cylinders using a second crane coupled to thebase, the first attachment coupling to the drill pipe; rotating thedrill pipe via the first attachment to cut the casing into first andsecond segments with one or more knives coupled to the drill pipe;moving the first attachment into a second position with the secondcrane, wherein the first attachment when in the second position is notaligned with the opening in the base and is not coupled to the drillpipe; moving a second attachment into the first position with the secondcrane, the second attachment coupling with the drill pipe when in thefirst position; coupling the drill pipe to the first segment of thecasing; and lifting the drill pipe and the first segment of the casingusing the second attachment.
 18. The method of claim 17, furthercomprising: decoupling the one or more knives from the drill pipe; andcoupling one or more spears to the drill pipe.
 19. The method of claim18, further comprising engaging the one or more spears with the firstsegment of the casing to couple the first segment of the casing to thedrill pipe.
 20. The method of claim 19, further comprising removing thedrill pipe and the first segment of the casing from the wellbore.